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Related Concept Videos

Types of Step-Growth Polymers: Polyesters01:20

Types of Step-Growth Polymers: Polyesters

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The introduction of polyesters has brought major development to the textile industry. The wrinkle-free behavior of polyester blends has eliminated the need for starching and ironing clothes.
Polyesters are commonly prepared from terephthalic acid and ethylene glycol; the crude product is known as poly(ethylene terephthalate) or PET. However, polyesters are synthesized industrially by transesterification of dimethyl terephthalate with ethylene glycol at 150 °C. The two reactants and the...
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Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)00:53

Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)

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Acyclic diene metathesis polymerization or ADMET polymerization involves cross-metathesis of terminal dienes, such as 1,8-nonadiene, to give linear unsaturated polymer and ethylene. As ADMET is a reversible process, the formed ethylene gas must be removed from the reaction mixture to complete the polymerization process.
Similar to cross-metathesis, ADMET also involves the formation of metallacyclobutane intermediate by [2+2] cycloaddition of one of the double bonds of a terminal diene with...
1.9K
Step-Growth Polymerization: Overview01:03

Step-Growth Polymerization: Overview

3.4K
Step-growth or condensation polymerization is a stepwise reaction of bi or multifunctional monomers to form long-chain polymers. As all the monomers are reactive, most of the monomers are consumed at the early stages of the reaction to form small chains of reactive oligomers, which then combine to form long polymer chains in the late stages. Hence, the reaction has to proceed for a long time to achieve high molecular weight polymers.
Many natural and synthetic polymers are produced by...
3.4K
Cationic Chain-Growth Polymerization: Mechanism00:57

Cationic Chain-Growth Polymerization: Mechanism

2.3K
The cationic polymerization mechanism consists of three steps: initiation, propagation, and termination. In the initiation step of the polymerization process, the π bond of a monomer gets protonated by the Lewis acid catalyst, which is formed from boron trifluoride and water. The protonation of the π bond generates a carbocation stabilized by the electron‐donating group. In the propagation step, the π bond of the second monomer acts as a nucleophile and attacks the...
2.3K
Free-Radical Chain Reaction and Polymerization of Alkenes02:35

Free-Radical Chain Reaction and Polymerization of Alkenes

7.8K
The conversion of alkenes to macromolecules called polymers is a reaction of high commercial importance. The structure of the polymer is defined by a repeating unit, while the terminal groups are considered insignificant. The average degree of polymerization represents the number of repeating units in the polymer molecule and is denoted by the subscript n.
7.8K
Anionic Chain-Growth Polymerization: Overview01:20

Anionic Chain-Growth Polymerization: Overview

2.1K
The polymerization process that involves carbanion as an intermediate is called anionic polymerization. It is also a type of addition or chain-growth polymerization. Anionic polymerization gets initiated by a strong nucleophile such as an organolithium or a Grignard reagent. The most commonly used initiator for anionic polymerization is butyl lithium. Monomers involved in anionic polymerization must possess a vinyl group bonded to one or two electron-withdrawing groups. For instance,...
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Related Experiment Video

Updated: Jun 18, 2025

Isolation of Native Soil Microorganisms with Potential for Breaking Down Biodegradable Plastic Mulch Films Used in Agriculture
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Isolation of Native Soil Microorganisms with Potential for Breaking Down Biodegradable Plastic Mulch Films Used in Agriculture

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A customized self-assembled synergistic biocatalyst for plastic depolymerization.

Wei Zhang1, Yuying Han1, Feng Yang1

  • 1Key Laboratory of Industrial Fermentation Microbiology of the Ministry of Education; Tianjin Key Laboratory of Industrial Microbiology, College of Biotechnology, Tianjin University of Science and Technology; National Engineering Laboratory for Industrial Enzymes, Tianjin 300457, China.

Journal of Hazardous Materials
|August 1, 2024
PubMed
Summary

Researchers developed a novel biocatalyst for efficient plastic degradation. This enzyme-based approach enhances polyester waste recycling, offering a sustainable solution for environmental challenges.

Keywords:
MHETasePETasePlastic degradationPolyethylene terephthalateSynergistic effect

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Immobilization of Multi-biocatalysts in Alginate Beads for Cofactor Regeneration and Improved Reusability
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Designed for Molecular Recycling: A Lignin-Derived Semi-aromatic Biobased Polymer
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Last Updated: Jun 18, 2025

Isolation of Native Soil Microorganisms with Potential for Breaking Down Biodegradable Plastic Mulch Films Used in Agriculture
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Immobilization of Multi-biocatalysts in Alginate Beads for Cofactor Regeneration and Improved Reusability
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Designed for Molecular Recycling: A Lignin-Derived Semi-aromatic Biobased Polymer
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Designed for Molecular Recycling: A Lignin-Derived Semi-aromatic Biobased Polymer

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Area of Science:

  • Biotechnology
  • Materials Science
  • Environmental Science

Background:

  • Plastic waste, particularly polyester, poses a significant environmental challenge.
  • Enzymatic degradation offers a sustainable and circular carbon route for plastic recycling.
  • PET hydrolase (PETase) and MHET hydrolase (MHETase) are key enzymes for PET depolymerization.

Purpose of the Study:

  • To design a robust and efficient synergistic biocatalyst for direct PET degradation.
  • To enhance enzyme adsorption onto PET surfaces and improve enzyme stability.
  • To enable scalable biocatalytic upcycling of polyester waste.

Main Methods:

  • Engineered hydrophobin HFBI fused-PETase and MHETase for improved PET surface interaction and stability.
  • Developed a customized self-assembled synergistic biocatalyst (MC@CaZn-MOF) for a two-step depolymerization process.
  • Assessed catalyst adhesion, durability, and degradation efficiency on untreated AGf-PET.

Main Results:

  • The tailored MC@CaZn-MOF biocatalyst demonstrated enhanced adhesion and durability, retaining over 70% activity after 120 hours at pH 8.0 and 60°C.
  • MC@CaZn-MOF directly decomposed untreated AGf-PET, achieving over 90% weight loss and producing 9.5 mM TPA.
  • The bifunctional catalyst facilitated efficient depolymerization of polyester waste.

Conclusions:

  • The developed MC@CaZn-MOF represents a significant advancement in large-scale biocatalytic PET degradation.
  • This approach offers a feasible strategy for polymer upcycling and promotes environmental sustainability.
  • The synergistic biocatalyst design enhances efficiency and stability for practical plastic waste management.